In a letter to the Energy Department's Office of Inspector General on Thursday, Wyden called on the watchdog to "immediately resume" its probe of the Portland-based Bonneville Power Administration.

ADVERTISEMENT

The OIG released a scathing report in October that said Bonneville's human resource management had discriminated against military veterans seeking employment there.

The watchdog report also said a culture of intimidation was fostered toward whistle-blowers at Bonneville.

Wyden's letter adds to the ongoing hiring scandal.

"I have obtained credible evidence of continued retaliation against a BPA Human Capital Management staffer that occurred as late as November 2013, well after the IG issued a Management Alert," Wyden wrote to the energy watchdog.